Relationship between weather regimes and atmospheric rivers in East Antarctica
Here, we define weather regimes in the East Antarctica—Southern Ocean sector based on daily anomalies of 700 hPa geopotential height derived from ERA5 reanalysis during 1979–2018. Most regimes and their preferred transitions depict synoptic-scale disturbances propagating eastwards off the Antarctic...
Published in: | Journal of Geophysical Research: Atmospheres |
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Amer Geophysical Union
2021
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ftunivtasmania:oai:eprints.utas.edu.au:46140 2023-05-15T13:43:28+02:00 Relationship between weather regimes and atmospheric rivers in East Antarctica Pohl, B Favier, V Wille, J Udy, DG Vance, TR Pergaud, J Dutrievoz, N Blanchet, J Kittel, C Amory, C Krinner, G Codron, F 2021 https://eprints.utas.edu.au/46140/ unknown Amer Geophysical Union Pohl, B, Favier, V, Wille, J, Udy, DG, Vance, TR orcid:0000-0001-6970-8646 , Pergaud, J, Dutrievoz, N, Blanchet, J, Kittel, C, Amory, C, Krinner, G and Codron, F 2021 , 'Relationship between weather regimes and atmospheric rivers in East Antarctica' , Journal of Geophysical Research: Atmospheres, vol. 126, no. 24 , pp. 1-25 , doi:10.1029/2021JD035294 <http://dx.doi.org/10.1029/2021JD035294>. Southern Indian Ocean synoptics atmospheric dynamics climate variability Article PeerReviewed 2021 ftunivtasmania https://doi.org/10.1029/2021JD035294 2022-06-13T22:16:37Z Here, we define weather regimes in the East Antarctica—Southern Ocean sector based on daily anomalies of 700 hPa geopotential height derived from ERA5 reanalysis during 1979–2018. Most regimes and their preferred transitions depict synoptic-scale disturbances propagating eastwards off the Antarctic coastline. While regime sequences are generally short, their interannual variability is strongly driven by the polarity of the Southern Annular Mode (SAM). Regime occurrences are then intersected with atmospheric rivers (ARs) detected over the same region and period. ARs are equiprobable throughout the year, but clearly concentrate during regimes associated with a strong atmospheric ridges/blockings on the eastern part of the domain, which act to channel meridional advection of heat and moisture from the lower latitudes towards Antarctica. Both regimes and ARs significantly shape climate variability in Antarctica. Regimes favorable to AR occurrences are associated with anomalously warm and humid conditions in coastal Antarctica and, to a lesser extent, the hinterland parts of the Antarctic plateau. These anomalies are strongly enhanced during AR events, with warmer anomalies and dramatically amplified snowfall amounts. Large-scale conditions favoring AR development are finally explored. They show weak dependency to the SAM, but particularly strong atmospheric ridges/blockings over the Southern Ocean appear as the most favorable pattern, in which ARs can be embedded, and to which they contribute. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean The Antarctic East Antarctica Indian Journal of Geophysical Research: Atmospheres 126 24 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
Southern Indian Ocean synoptics atmospheric dynamics climate variability |
spellingShingle |
Southern Indian Ocean synoptics atmospheric dynamics climate variability Pohl, B Favier, V Wille, J Udy, DG Vance, TR Pergaud, J Dutrievoz, N Blanchet, J Kittel, C Amory, C Krinner, G Codron, F Relationship between weather regimes and atmospheric rivers in East Antarctica |
topic_facet |
Southern Indian Ocean synoptics atmospheric dynamics climate variability |
description |
Here, we define weather regimes in the East Antarctica—Southern Ocean sector based on daily anomalies of 700 hPa geopotential height derived from ERA5 reanalysis during 1979–2018. Most regimes and their preferred transitions depict synoptic-scale disturbances propagating eastwards off the Antarctic coastline. While regime sequences are generally short, their interannual variability is strongly driven by the polarity of the Southern Annular Mode (SAM). Regime occurrences are then intersected with atmospheric rivers (ARs) detected over the same region and period. ARs are equiprobable throughout the year, but clearly concentrate during regimes associated with a strong atmospheric ridges/blockings on the eastern part of the domain, which act to channel meridional advection of heat and moisture from the lower latitudes towards Antarctica. Both regimes and ARs significantly shape climate variability in Antarctica. Regimes favorable to AR occurrences are associated with anomalously warm and humid conditions in coastal Antarctica and, to a lesser extent, the hinterland parts of the Antarctic plateau. These anomalies are strongly enhanced during AR events, with warmer anomalies and dramatically amplified snowfall amounts. Large-scale conditions favoring AR development are finally explored. They show weak dependency to the SAM, but particularly strong atmospheric ridges/blockings over the Southern Ocean appear as the most favorable pattern, in which ARs can be embedded, and to which they contribute. |
format |
Article in Journal/Newspaper |
author |
Pohl, B Favier, V Wille, J Udy, DG Vance, TR Pergaud, J Dutrievoz, N Blanchet, J Kittel, C Amory, C Krinner, G Codron, F |
author_facet |
Pohl, B Favier, V Wille, J Udy, DG Vance, TR Pergaud, J Dutrievoz, N Blanchet, J Kittel, C Amory, C Krinner, G Codron, F |
author_sort |
Pohl, B |
title |
Relationship between weather regimes and atmospheric rivers in East Antarctica |
title_short |
Relationship between weather regimes and atmospheric rivers in East Antarctica |
title_full |
Relationship between weather regimes and atmospheric rivers in East Antarctica |
title_fullStr |
Relationship between weather regimes and atmospheric rivers in East Antarctica |
title_full_unstemmed |
Relationship between weather regimes and atmospheric rivers in East Antarctica |
title_sort |
relationship between weather regimes and atmospheric rivers in east antarctica |
publisher |
Amer Geophysical Union |
publishDate |
2021 |
url |
https://eprints.utas.edu.au/46140/ |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctica Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctica Indian |
genre |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Southern Ocean |
op_relation |
Pohl, B, Favier, V, Wille, J, Udy, DG, Vance, TR orcid:0000-0001-6970-8646 , Pergaud, J, Dutrievoz, N, Blanchet, J, Kittel, C, Amory, C, Krinner, G and Codron, F 2021 , 'Relationship between weather regimes and atmospheric rivers in East Antarctica' , Journal of Geophysical Research: Atmospheres, vol. 126, no. 24 , pp. 1-25 , doi:10.1029/2021JD035294 <http://dx.doi.org/10.1029/2021JD035294>. |
op_doi |
https://doi.org/10.1029/2021JD035294 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
126 |
container_issue |
24 |
_version_ |
1766189248617119744 |